Furthermore, The SafeDive procedure requires an outer circumstance (on which the outer bezel is mounted) which permits the ingress and egress of h2o, and an internal case, which can be chargeable for shielding the movement. The protrusion at 9:00 properties the coupling gear mechanism linking the inner and outer bezels. https://www.watchesworld.com/frozen-in-time-luxury-watches-for-winter/